Record number :
53060
Title of article :
Effects of melt percolation on the Re¯Os systematics of peridotites from a Paleozoic convergent plate margin
Author/Authors :
Carlson، Richard W. نويسنده , , Becker، Harry نويسنده , , Shirey، Steven B. نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2001
Pages :
-106
From page :
107
To page :
0
Abstract :
A distal tephra has been discovered in the varved lacustrine succession of Piànico-Sèllere, one of the best-preserved interglacial sedimentary assemblages, south to the Italian Alps. The K¯Ar dating of the juvenile glass fraction gives an age of 779±13 ka. This age is supported by the observation of a reverse paleomagnetic direction, probably recorded before the Matuyama¯Brunhes transition dated at 780 ka. The tephra belongs to the shoshonite series and the volcanic source is likely located in Southern Italy. The age of 779±13 ka is much older than that of the `Riss¯Wurmʹ interglacial, which was previously suggested on the basis of geological setting and macroflora studies. The Piànico tephra represents the first stratigraphical marker of an interglacial so far unsettled in the Southern Alps.
Keywords :
plate convergence , Os-188/Os-187 , Rhenium , peridotites , metasomatism , plate boundaries
Journal title :
EARTH & PLANETARY SCIENCE LETTERS
Serial Year :
2001
Link To Document :
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